Roi Reichart

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Dan Klein74
Christopher D. Manning74
Mark Johnson55
Ryan T. Mcdonald49
Eugene Charniak49
36Ari Rappoport
31Anna Korhonen
16Ivan Vulić
15Simonetta Montemagni
15Felice Dell'Orletta

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Publication Year

2007
2017

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SimLex-999: Evaluating Semantic Models With (Genuine) Similarity Estimation
We present SimLex-999, a gold standard resource for evaluating distributional semantic models that improves on existing resources in several important ways. First, in contrast to gold standards such as WordSim-353 and MEN, it explicitly quantifies similarity rather than association or relatedness so that pairs of entities that are associated but not… (More)
The NVI Clustering Evaluation Measure
Clustering is crucial for many NLP tasks and applications. However, evaluating the results of a clustering algorithm is hard. In this paper we focus on the evaluation setting in which a gold standard solution is available. We discuss two existing information theory based measures , V and VI, and show that they are both hard to use when comparing the… (More)
Neutralizing Linguistically Problematic Annotations in Unsupervised Dependency Parsing Evaluation
Dependency parsing is a central NLP task. In this paper we show that the common evaluation for unsupervised dependency parsing is highly sensitive to problematic annotations. We show that for three leading unsupervised set of parameters can be found whose modification yields a significant improvement in standard evaluation measures. These parameters… (More)
Self-Training for Enhancement and Domain Adaptation of Statistical Parsers Trained on Small Datasets
Creating large amounts of annotated data to train statistical PCFG parsers is expensive, and the performance of such parsers declines when training and test data are taken from different domains. In this paper we use self-training in order to improve the quality of a parser and to adapt it to a different domain , using only small amounts of manually… (More)
Modeling the Detection of Textual Cyberbullying
The scourge of cyberbullying has assumed alarming proportions with an ever-increasing number of adolescents admitting to having dealt with it either as a victim or as a bystander. Anonymity and the lack of meaningful supervision in the electronic medium are two factors that have exacerbated this social menace. Comments or posts involving sensitive topics… (More)
Confidence Driven Unsupervised Semantic Parsing
Current approaches for semantic parsing take a supervised approach requiring a considerable amount of training data which is expensive and difficult to obtain. This supervision bottleneck is one of the major difficulties in scaling up semantic parsing. We argue that a semantic parser can be trained effectively without annotated data, and introduce an… (More)
Multi-Task Active Learning for Linguistic Annotations
We extend the classical single-task active learning (AL) approach. In the multi-task active learning (MTAL) paradigm, we select examples for several annotation tasks rather than for a single one as usually done in the context of AL. We introduce two MTAL meta-protocols, alternating selection and rank combination , and propose a method to implement them in… (More)
An Unsupervised Model for Instance Level Subcategorization Acquisition
Most existing systems for subcategoriza-tion frame (SCF) acquisition rely on supervised parsing and infer SCF distributions at type, rather than instance level. These systems suffer from poor portability across domains and their benefit for NLP tasks that involve sentence-level processing is limited. We propose a new unsuper-vised, Markov Random Field-based… (More)
Unsupervised Argument Identification for Semantic Role Labeling
The task of Semantic Role Labeling (SRL) is often divided into two sub-tasks: verb argument identification, and argument classification. Current SRL algorithms show lower results on the identification sub-task. Moreover, most SRL algorithms are supervised, relying on large amounts of manually created data. In this paper we present an unsupervised algorithm… (More)